Precious metal alloy



Patented Apr. 23, 1940 UNITED STATES PATENT OFFICE No Drawing. Application March 11, 1939, Serial No. 261,318

1 Claim.

This invention relates generally to alloys but more particularly to a precious metal alloy for use in the dental art.

It has for one of its objects to provide a light- 5 weight, precious metal alloy of this character which is so formulated that it requires no special equipment or technique for its handling, and which casts clean and dense.

Another object of the invention is the provi- 10 sion of a precious metal casting alloy which can be soldered to, repaired or adjusted, and which has been especially formulated for the making of castings where economy is essential and dependability necessary.

A still further object is to provide an alloy of this character which is economical in use, which is light in weight, and which is strong and resilient.

This improved precious metal alloy has been 90 especially formulated and developed for the casting of articles used in the dental profession, such for example as partial dentures, bars, clasps, saddles, etc., and which material requires no special equipment or technique for handling.

25 To this end, the alloy is composed primarily or predominantly of silver, palladium, and copper and a relatively small percentage of gold and zinc. In its preferred embodiment the alloy is composed of the following elements in substantially the portions indicated:

Zin 1 The alloy formulated from the above-named elements, and in substantially the proportions indicated, is of exceptionally light weight, being approximately one-third lighter in weight than alloys heretofore used for similar purposes and it 5 is strong and resilient. It is platinum in color, it casts clean and dense, and it has the further property that it can be readily repaired or adjusted, and can be soldered to. Furthermore, it is inexpensive and particularly adaptable for the 10 1 making of dental castings where economy and 27% of palladium, about 14% of copper, about 25 I 2% of gold, and about 1% of zinc.

REGINALD V. WILLIAMS. 

